I would ask for some phys therapy & assessment.
Often MDs don't do a hands on or know everything about the body.
A good PT will do hands on evaluation to better tell if neck or disk is the problem..

If you do /did repetitive work/ desk job, have forward head /shoulders - those can cause arm issues also, by closing the area where nerves & blood flow pas in the neck/chest junction. See our Thoracic outlet syndrome (TOS) forum for more info on that..